The Air high quality in Kolkata turned poorer on Sunday night from what it was 24 hours in the past on the Kali puja and Diwali day, but it surely was nonetheless higher when in comparison with that recorded a day after the festivals final yr, an official of the West Bengal Air pollution Management Board mentioned.
The Air High quality Index (AQI) was greater than Saturday’s determine throughout town. Although the air high quality remained ‘poor’ in north Kolkata, it continued to be average elsewhere.
The automated air monitoring station at Rabindra Bharati College campus in congested north Kolkata recorded the AQI at 287 (PM 2.5) at eight pm on Sunday whereas it was 226 on the identical time on Saturday, the WBPCB official mentioned.
An AQI between 101 and 200 is taken into account ‘average’, 201-300 ‘poor’, 301-400 ‘very poor’ and 401-500 ‘extreme’, whereas the AQI above 500 falls within the extreme plus class.
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On Sunday, the AQI was 187 at Ballygunge in south Kolkata, 186 at Victoria within the central a part of town and 146 in east Kolkata’s Bidhan Nagar. On the Diwali night on Saturday, the AQI at these three locations had been 142, 115 and 151 respectively.
The AQI measured at Rabindra Bharati College was past 700 on the evenings of Kali Puja and Diwali evenings in 2019, the official mentioned. Nevertheless, the AQI elsewhere within the metropolis had hovered between 300 and 500.
Diwali is well known in the course of the transition of two seasons – post-monsoon and pre-winter – when meteorological situations don’t assist dilution and dispersion of pollution because of low atmospheric boundary layer, low air flow and low wind pace, the official mentioned.
On this transition part, the ambient temperature, significantly at night time, decreases and permits all pollution to come back near floor degree, particularly in whole Indo-Gangetic plains, he mentioned.
The impression of bursting of firecrackers was alarming in 2019, and there was a blanket ban on fireworks this yr. However reducing of night time temperature was a lot important, he mentioned attributing the rise of the AQI to the night time temperature situations.
The Calcutta Excessive Courtroom had final week ordered a blanket ban on using fireworks in West Bengal throughout Kali puja, Diwali, Chhath and different pujas throughout this festive season to curb air pollution amid the COVID-19 pandemic.
Within the earlier years, solely firecrackers that emit over 90 decibels of sound weren’t allowed by the WBPCB, and there was no ban on fireworks that emit mild.
“Our management room is monitoring the state of affairs 24×7 even as we speak. We’re collating figures. Up to now the state of affairs stays largely below management,” he mentioned.
Environmentalist S M Ghosh mentioned, “Due to the court docket order, public consciousness and actions of the Kolkata Police, well being specialists and NGOs, air air pollution is much less.
Nevertheless, there shouldn’t be any laxity as AQI degree within the ‘poor’ trigger respiratory issues to individuals, he mentioned.